OSPP2024：面向 LLVM 开发调试场景新增实用功能选项 · Pull Request !93 · openEuler/llvm-project

### Overview
add `-dump-file` option for debug the pass
`-dump-file` can be used in conjunction with options like `--print-after`, `--print-after-all`, `--print-changed`, `--passes`, and `--filter-passes`, to print the IR to a file after all passes in a specific pass or pass pipeline have been executed.

### Run Tests
`llvm-lit ../llvm/test/Other/dump-file.ll` for auto test

### Option usuage examples
- print the IR to file after all the passes during -O2 pass pipeline
`clang -O2 -mllvm -print-after-all -mllvm -dump-file test.c`

- print the IR to file only after the passes have changed the IR during  -O2 pass pipeline 
`clang -O2 -mllvm -print-changed -mllvm -dump-file test.c`

- Print the IR generated only after certain passes.
`opt -O2 -print-after=early-cse -dump-file -S dump-changed-files.ll`

- When used with `-print-changed`, print only after the pass actually modified IR.
`opt -O2 -print-changed -dump-file -S  dump-changed-files.ll`

- When used with `-print-changed` and `-filter-passes`, print only the passes specified by `-filter-passes` and the actually modified IR.
`opt -O2 -print-changed -dump-file -filter-passes="early-cse" -S dump-changed-files.ll`

- See the effect of a single pass only.
`opt -print-changed -dump-file -passes="early-cse" -S dump-changed-files.ll` or `opt -passes="early-cse"  -print-after-all -dump-file  -S dump-changed-files.ll`

- View only the modifications to certain functions.
`opt  -print-changed -filter-print-funcs=f  -dump-file  -S dump-changed-files.ll`

**Note**: Here, the name of a pass may be different from what is printed. Use `opt --print-passes` to get the pass names.

see the `llvm/test/Other/dump-file.ll` file for more usage examples.

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